Two different coordination modes of the Schiff base derived from ortho-vanillin and 2-(2-aminomethyl)pyridine in a mononuclear uranyl complex

Sokratis T Tsantis; Zoi G Lada; Demetrios I Tzimopoulos; Vlasoula Bekiari; Vassilis Psycharis; Catherine P Raptopoulou; Spyros P Perlepes

doi:10.1016/j.heliyon.2022.e09705

Two different coordination modes of the Schiff base derived from ortho-vanillin and 2-(2-aminomethyl)pyridine in a mononuclear uranyl complex

Heliyon. 2022 Jun 11;8(6):e09705. doi: 10.1016/j.heliyon.2022.e09705. eCollection 2022 Jun.

Authors

Sokratis T Tsantis^{1

2}, Zoi G Lada², Demetrios I Tzimopoulos³, Vlasoula Bekiari⁴, Vassilis Psycharis⁵, Catherine P Raptopoulou⁵, Spyros P Perlepes^{1

2}

Affiliations

¹ Department of Chemistry, University of Patras, 26504 Patras, Greece.
² Institute of Chemical Engineering Sciences, Foundation for Research and Technology-Hellas (Forth/ICE-HT), Platani, P.O. Box 1414, 26504 Patras, Greece.
³ Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
⁴ Department of Crop Science, University of Patras, 30200 Messolonghi, Greece.
⁵ Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15310 Aghia Paraskevi Attikis, Greece.

Abstract

This work describes the reaction of the potentially tetradentate Schiff-base ligand N-(2-pyridylmethy)-3-methoxysalicylaldimine (HL) with UO₂(O₂CMe)₂·2H₂O and UO₂(NO₃)₂· 6H₂O in MeOH in the absence or presence of an external base, respectively. The product from these reactions is the mononuclear complex [UO₂(L)₂] (1). Its structure has been determined by single-crystal, X-ray crystallography. The anionic ligand adopts two different coordination modes (1.1011, 1.1010; Harris notation) in the complex. The new compound was fully characterized by solid-state (IR, Raman and Photoluminescence spectroscopies) and solution (UV-Vis and ¹H NMR spectra, conductivity measurements) techniques.

Keywords: Coordination chemistry; Crystal structure; N-(2-pyridylmethyl)-3-methoxysalicylaldimine; Schiff-base ligand; UV/Vis spectral studies; Uranyl(VI) complex; Vibrational spectra.